/*
 * Tencent is pleased to support the open source community by making Angel available.
 *
 * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/Apache-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 *
 */
package com.tencent.angel.sona.tree.gbdt.histogram;

import com.tencent.angel.sona.tree.gbdt.tree.GBDTParam;

public interface GradPair {
    void plusBy(GradPair gradPair);

    void subtractBy(GradPair gradPair);

    GradPair plus(GradPair gradPair);

    GradPair subtract(GradPair gradPair);

    void timesBy(double x);

    boolean satisfyWeight(GBDTParam param);

    float calcGain(GBDTParam param);

    public float calcWeight(GBDTParam param);

    public float[] calcWeights(GBDTParam param);

    GradPair copy();

    void clear();
}
